We’re investigating an issue affecting CheckBook and CheckBook Pro folks who’ve upgraded to macOS Catalina, where their document is stored on an external drive, resulting in the application telling the user the document can’t be accessed because of a permissions issue. This isn’t something CheckBook itself causes, as far as we can tell, but we’re on the case, learning more details, and will update you here with what we find. In the meantime, if you have your document on an external or removable drive and get an error about permissions, your data is safe but needs to be copied to your startup drive. Copy your document to your Documents folder and double-click it there. CheckBook will open that copy automatically going forward. Stay away from the original copy on the external drive until we get to the bottom of this, and get in touch at firstname.lastname@example.org if you need any help before then!